Derrick.



Patented Nov. v16, 1915.

WITNESSES mvgnnon E'EL'TE JILLZAE I GBRIEN, GE HASHII? CG \TSTRUGTI-ONCOMZANY, EENNSYLVANZA,

7 I633 TO OBRIEN STEEL "IA, A GQRPQBATIQN QF Applicatian filed J' To allwhom it may wnwm Be it know; that I citizen of the Unit lVnshixwton, the5 and Stale of E? certain new and Y n l'rl '1 J1 b. 'v lje nc lim Oi111m, L l :9; 2.11. inher- $321911. l (l Aiacilliating the 513' lnvenpign $011515 .nprovemel t I l 30stsecizisn wiin rslatien m "t'uctui'al Irmnew secticn is provided at its known :1: deyricks, u Lila-lopenin 's ll) mlznt rl other uses, Structural :0 M p l the like.

1% has for its object struction 0f such type. the ereciion, attachnvelopmeni of 'ihe bu; 7 simple, compact struci'ure morefullyhereinaftei' Referfngto lie 0 l sents in elemticn a partion GT 3derrick embodying my in\'en"ion.

riveis (l, m:- W1 m;

t. as $1 0 the provide (letzii 1H. i, 01 i de'uul new .l

. next sncceeuing re ivmlzng 50 501%?) at tructure 13 thus 91':

. 1 l l1 7 am: ams-d mm swx umt A, lorlnmg bent. The angle sectionremlorclng over zzppmg mam l'efspectu'elv, also 0f amrle tnpa ber-lpreferz-lbly having angular corner, cleazlv SlKf-XD the outside of.the man.

Remfa-rcmg; nmmlrers 59 manently secured in length to the uppei' by one01' vantage, :32 not be entnelv emm'ed, and are with 110325 i wesecuring bolis a r 'rl-r may be changed or varied, and that it may bebuilt of any desired weight of-material, by the skilledmechanic; but allsuch of adjacent rectangular corner members each having a-partial bolthole opening adapted to register with the other, inner and outerrectangular connecting joint members, braces connecting the severalcorner members of the derrick, and bolts extending through the ends ofsaid several braces and through 'said members. a

3. In combination, an angle corner post having bolt holes through eachflange and partial bolt holes across'its ends, a similar co-actingadjacent corner post abutting against said post, and inner andoutercnverlapping angle joint members bolted to and securing togethersaid-posts, 4. In a derrick, the combination of a-plurahty of maincornerposts each consisting of angular sections in" abutting engagement, innerand outer angular 3o1nt members over:

lapping the abutting ends thereof, cross brace members connecting theseveral corner posts. and bolts extending through the ends of saidseveral brace members and through the post sectionsand joint member'srespectivelv. Y

In testimony whereof Ihereunto alfix my signatu 'e in the presence oftwo witnesses.

WILL'EAM OBRIENQ- Witnesses.

H. IIECK, C. M. CLARKE.

